package com.hmdp.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.bean.copier.CopyOptions;
import cn.hutool.core.lang.UUID;
import cn.hutool.core.util.RandomUtil;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.dto.LoginFormDTO;
import com.hmdp.dto.Result;
import com.hmdp.dto.UserDTO;
import com.hmdp.entity.User;
import com.hmdp.mapper.UserMapper;
import com.hmdp.service.IUserService;
import com.hmdp.utils.RedisConstants;
import com.hmdp.utils.RegexPatterns;
import com.hmdp.utils.RegexUtils;
import com.hmdp.utils.UserHolder;
import lombok.extern.slf4j.Slf4j;
import org.springframework.data.redis.connection.BitFieldSubCommands;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import javax.annotation.Resource;
import javax.servlet.http.HttpSession;

import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.TimeUnit;

import static com.hmdp.utils.RedisConstants.*;
import static com.hmdp.utils.SystemConstants.USER_NICK_NAME_PREFIX;

/**
 * <p>
 * 服务实现类
 * </p>
 *
 * @author 虎哥
 * @since 2021-12-22
 */
@Service
@Slf4j
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements IUserService {

    @Resource
    private StringRedisTemplate stringRedisTemplate;


    /**
     * 发送验证码
     * @param phone
     * @param session
     * @return
     */
    @Override
    public Result sendCode(String phone, HttpSession session) {
        //1.校验手机号
        if (RegexUtils.isPhoneInvalid(phone)){
            //2.如果不符合，返回错误信息
             return Result.fail("手机号格式错误");
        }
        //3.符合，生成验证码
        String code = RandomUtil.randomNumbers(6);
        //4.保存验证码到session中
//        session.setAttribute("code",code);
        //4.1 改进  将验证码保存到redis中   并设置键值的有效期
        stringRedisTemplate.opsForValue().set(LOGIN_CODE_KEY +phone,code,LOGIN_CODE_TTL, TimeUnit.MINUTES);
        //5.发送验证码
        log.info("验证码:{}发送成功",code);
        //返回ok
        return Result.ok();
    }

    /**
     * 登录
     * @param loginForm
     * @param session
     * @return
     */
    @Override
    public Result login(LoginFormDTO loginForm, HttpSession session) {
        //1.校验手机号
        String phone = loginForm.getPhone();
        if (RegexUtils.isPhoneInvalid(phone)){
            return Result.fail("手机号格式不正确");
        }
        // 2. 改进  从redis中获取验证码
        String cacheCode = stringRedisTemplate.opsForValue().get(LOGIN_CODE_KEY+phone);
        String code = loginForm.getCode();
        if(cacheCode == null || !cacheCode.equals(code)){
            //3.不一致报错
            return Result.fail("验证码错误");
        }
        //4.一致，根据手机号查询用户
        User user = query().eq("phone",phone).one();
        //5.判断用户是否存在
        if(user == null){
            //6.不存在，创建新用户并保存
            user = createUserWithPhone(phone);
        }
        // 7. 保存用户信息到redis中
        // 7.1 随机生成token，作为登录令牌
        String token = UUID.randomUUID().toString(true);
        UserDTO userDTO = BeanUtil.copyProperties(user, UserDTO.class);
        session.setAttribute("user", userDTO);

        // 7.2 将User对象转为hash存储
        Map<String, Object> map = BeanUtil.beanToMap(userDTO,new HashMap<>(), CopyOptions.create()
                .setIgnoreNullValue(true)
                .setFieldValueEditor((fieldName,fieldValue)->fieldValue.toString()));//解决Long类型转String报错问题
        // 7.3 存储到redis中
        String tokenKey = LOGIN_USER_KEY+token;
//        map.put("id",map.get("id").toString());//解决Long类型转String报错 问题
        stringRedisTemplate.opsForHash().putAll(tokenKey,map);
        // 7.4 设置有效期
        stringRedisTemplate.expire(tokenKey,LOGIN_USER_TTL,TimeUnit.MINUTES);
        // 8 返回token
        return Result.ok(token);
    }

    /**
     * 签到功能
     * @return
     */
    @Override
    public Result sign() {
        //1. 获取当前登录用户
        Long userId = UserHolder.getUser().getId();
        //2. 获取日期
        LocalDateTime now = LocalDateTime.now();
        String signSuffix = now.format(DateTimeFormatter.ofPattern(":yyyyMM"));
        //3. 拼接key
        String key = USER_SIGN_KEY+userId+signSuffix;
        //4. 获取今天是本月第几天
        int dayOfMonth = now.getDayOfMonth();
        //5. 写入redis setbit key offset 1
        stringRedisTemplate.opsForValue().setBit(key,dayOfMonth-1,true);
        return Result.ok();
    }

    /**
     * 统计用户截止到今天连续签到天数
     * @return
     */
    @Override
    public Result signCount() {
        //1. 获取当前登录用户
        Long userId = UserHolder.getUser().getId();
        //2. 获取日期
        LocalDateTime now = LocalDateTime.now();
        String signSuffix = now.format(DateTimeFormatter.ofPattern(":yyyyMM"));
        //3. 拼接key
        String key = USER_SIGN_KEY+userId+signSuffix;
        //4. 获取今天是本月第几天
        int dayOfMonth = now.getDayOfMonth();
        //5. 获取本月截止到今天的所有签到记录，返回的是一个十进制数据 bitfield sign:5:202203 get u14 0
        List<Long> result = stringRedisTemplate.opsForValue().bitField(key,
                BitFieldSubCommands.create().get(BitFieldSubCommands.BitFieldType.unsigned(dayOfMonth)).valueAt(0));
        if(result == null || result.isEmpty()){
            return Result.ok(0);
        }
        Long num = result.get(0);
        if(num == 0 || num == null){
            return Result.ok(0);
        }
        int count = 0;
        //6. 循环遍历
        while(true) {
            //6.1. 让这个数字与1做与运算,得到数字的最后一个bit位,判断这个bit位是否为0
            if ((num & 1) == 0) {
                // 如果为0，说明未签到，结束
                break;
            }else{
                // 如果不为0，说明已签到，计数器+1
                count++;
                // 把数字右移一位，抛弃最后一个bit位，继续下一个bit位
            }
            num >>>= 1;
        }
        return Result.ok(count);
    }

    private User createUserWithPhone(String phone){
        //1.创建用户
        User user = new User();
        user.setPhone(phone);
        user.setNickName(USER_NICK_NAME_PREFIX+RandomUtil.randomString(10));
        //2.保存用户
        save(user);
        return user;
    }
}
